50 mg of **Zinc** per tablet is a hefty dose — well above the 15–30 mg range typically studied for immune support, wound healing, and skin health. Zinc has strong clinical evidence behind it, with meta-analyses showing it can shorten common cold duration by roughly a third.

The citrate form absorbs reasonably well — not top-tier like picolinate or bisglycinate, but adequate for most purposes. One tablet daily keeps it simple.

The important detail: 50 mg exceeds the tolerable upper limit of 40 mg per day. Taking this daily over months can interfere with your copper absorption, potentially causing its own set of problems. If you're using this long-term rather than for short-term immune support, pairing it with 1–2 mg of copper and discussing the dose with your doctor is worth doing.

BioStacks
Natural Factors

Zinc Citrate 50 mg

1 Tablet · 90 servings

iHerbAmazon

Best for

Immune

Ingredients (1)

Zinc

100%

Dose

50 mg

Target

15–30 mg

Form

Standard

Other Ingredients (4)

Magnesium StearateLubricant

A salt of stearic acid used as a lubricant in tablet and capsule production

Silicon DioxideAnti-caking

Fine silica powder used to prevent clumping

Microcrystalline CelluloseBinder

Plant-derived cellulose used as a binder and filler in supplements

Stearic AcidLubricant

Saturated fatty acid used as tablet lubricant

How to Take It

Take it anytime

Take with food — on an empty stomach it commonly causes nausea.

With food
Space it a couple of hours from Iron and Calcium

On the label

Suggested Usage: 1 tablet per day or as directed by a health professional.

General guidance based on the ingredients, not a substitute for the label or your doctor.

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Sources & Scoring

Nutrient data (RDA, UL, and safety thresholds) sourced from: NIH Office of Dietary Supplements and National Academies Dietary Reference Intakes (DRI).

This is not medical advice. Consult a healthcare provider before making changes to your supplement routine.

The score analyzes what's on the label: ingredient doses vs. clinical ranges, chemical forms, evidence levels, and known interactions. It does not verify label accuracy or test for contaminants — for that, look for third-party certifications like USP or NSF.

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